已知:x²-4x+y²-10y+29=0,求(x+y)²
已知x²+y²-8x+6y+25=0,求(x-y+4xy/x-y)(x+y-4xy/x+y)
已知非零有理数x,y满足x²-4xy+4y²=0,求x-y/x+y-y-x/x+y的值.
已知x/y=2,求2x(x+y)-y(x+y)/4x²-4xy+y²
已知x²+y²-2x+4y+5=0,求x+y
已知x²+4x+y-2y+5=0求x+2y
已知实数x, y满足x²+y²-2x+6y+10=0,求y∧-x.
已知x²+4y²-6x+8y+13=0,求x-y/x+y的值.
已知2x-y=10,求式子[(x^2+y^2)-(x-y)^2+2y(x-y)]/4y (4xy-2y²)/4
已知y+y'*x²=0,求y=?
已知x²-4x+y²-10y+29=0,求x²y²+2x³y³
请问已知x²-4x+29-10y+y²=0求x²y²+2x³y
已知x²+y²+5=2x+4y,求【2x²-(x-y)(x-y)】【(x+y-1)(x-y